On Tuesday, September 23, 2003, at 01:54 AM, Alan B. Pearce wrote:
> You don't say how close to the crystals you are putting the LEDs.

Within an inch.

> I would
> think that if you can mount the LEDs and crystals in a manner that
> means
> people cannot look directly at the LEDs then you will be OK.

In general this is the way the device is set up.

>  Ideally have
> the LED against a face of the crystal, with a suitable mask so that
> any UV
> has to pass through the crystal to reach the viewing public.

Again I don't have trusted info, but I've read in various places that
quartz is quite transparent to UV so it wouldn't really help other than
to scatter the energy (which might be enough?).

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